package day07;

import java.util.Random;
import java.util.Scanner;

public class VerificationCode {
    public static void main(String[] args) {
        String code = a(6);
        System.out.println("验证码为:"+code);
    }
    public static String a(int len){
        String code = "";
        char[] che = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n',
                'o','p','q','s','t','u','v','w','x','y','z','A','B','C','D',
                'E','F','G','H','I','J','K','L','M','N','O','P','Q','S','T',
                'U','V','W','X','Z','Y','1','2','3','4','5','6','7','8','9'};
        Random ran = new Random();
        for (int i=0;i<len;i++){
            int index = ran.nextInt(che.length);
            code += che[index];
        }
        return code;
    }


        /*
        String code = generateVeriCode(60);
        System.out.println("验证码:"+code);
    public static String generateVeriCode(int len){//生成验证码
        String code = "";
        char[] chs = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n',
                'o','p','q','s','t','u','v','w','x','y','z','A','B','C','D',
                'E','F','G','H','I','J','K','L','M','N','O','P','Q','S','T',
                'U','V','W','X','Z','Y','1','2','3','4','5','6','7','8','9'};
        Random rand = new Random();
        for(int i=1;i<=len;i++){//len次
            int index = rand.nextInt(chs.length);
            //int index = (int)(Math.random()*chs.length);//随机下标
            code += chs[index];//获取随机字符并拼接到code中
        }
        return code;
    }

         */
}
